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The oven was seen burning in the aftermath of Khashoggi's disappearance, and Turkish authorities believe the body was destroyed over three days, an Al Jazeera investigation found.

A worker who helped build the oven said that the Saudi consul gave very specific instructions - saying it needed to be deep and capable of melting metal.

The claims were made in an Al Jazeera documentary screened on Sunday.

The programme also states that Turkish intelligence chief Hakan Fidan, who was investigating the journalist's disappearance, demanded that Saudi Crown Prince Mohammed bin Salman explained to him what happened.

The furnace was inside the home of the Saudi consul-general in Istanbul, yards from the building where Khashoggi was killed (Image: aljazeera.com)

A man seemingly carrying Khashoggi's remains in a suitcase to the consul-general's home (Image: REUTERS)

Khashoggi had gone to the consulate to get documents required to marry fiancee Hatice Cengiz (Image: REUTERS)

Investigators were not given access to the consulate or the consul-general's home for two weeks following the journalist's disappearance.

Saudi authorities first denied any knowledge of what happened to him, but later admitted he had been killed by "rogue elements".

Al Jazeera's documentary claims that traces of Khashoggi's blood were found in the consul-general's office after fresh paint was removed.

A CIA report claims that the Saudi Crown Prince personally ordered the journalist's assassination, and the New York Times has previously reported that the royal had threatened to use a "bullet" to silence the critic of his regime.

Jamal Khashoggi was a Saudi journalist known for being a critic of his country's policies (Image: ALI HAIDER/EPA-EFE/REX/Shutterstock)

Saudi Arabia has denied official involvement has has indicted 11 people in connection with the murder.

But the country has rejected calls to extradite the suspects, saying it will try them itself.